API calls can't connect to DB but frontend is working

[argibbs]

I'm using Zabbix 7.0.17 on RHEL 7. I am able to make API calls but always get back this error:

{"jsonrpc":"2.0","error":{"code":1,"message":"Error connecting to database: No such file or directory","data":""},"id":2}

The frontend is having no issues talking to the database. I'm using a generated API token, which is Enabled, under a user that has API access Enabled. Under API Tokens it shows "Expires at" and "Last accessed" as Never. The latter is probably a symptom.

Here are two requests that both return the above error, where anything in [] just means it was redacted:

curl --request POST --url 'http://localhost/zabbix/api_jsonrpc.php' --header 'Content-Type: application/json-rpc' --data '{"jsonrpc":"2.0","method":"apiinfo.version","params":{},"id":1}'

curl -X POST -H "Content-Type: application/json-rpc" -d '{
    "jsonrpc": "2.0",
    "method": "host.get",
    "params": {
        "output": ["hostid", "host", "name"],
        "selectInterfaces": ["ip"]
    },
    "auth": "MY_TOKEN_REDACTED",
    "id": 2
}' http://localhost/zabbix/api_jsonrpc.php

I've tried searching for an answer but haven't come up with anything that explains why the API would have this error while the frontend is working fine. I don't see anything suspicious in the zabbix_server.log. My zabbix_server.conf is attached. Hopefully I'm missing something obvious. Thanks.

Edit: In case it matters, Zabbix is installed in /usr/share/zabbix and this is the zabbix.conf in /etc/httpd/conf.d:

#
# Zabbix monitoring system php web frontend
#

Alias /zabbix /usr/share/zabbix

<Directory "/usr/share/zabbix">
Options FollowSymLinks
AllowOverride None
Require all granted

<IfModule mod_php5.c>
php_value max_execution_time 300
php_value memory_limit 128M
php_value post_max_size 16M
php_value upload_max_filesize 4M
php_value max_input_time 300
php_value max_input_vars 10000
php_value always_populate_raw_post_data -1
# php_value date.timezone Europe/Riga
</IfModule>
</Directory>

<Directory "/usr/share/zabbix/conf">
Require all denied
</Directory>

<Directory "/usr/share/zabbix/app">
Require all denied
</Directory>

<Directory "/usr/share/zabbix/include">
Require all denied
</Directory>

<Directory "/usr/share/zabbix/local">
Require all denied
</Directory>