PHP 5.5.27 Opcache not working on Apache 2.4 CentOS 7

I've using PHP 5.5.27 installed on Apache 2.4 on CentOS 7. Opcache is showing on a phpinfo() page as:

Opcode Caching: Disabled

Yet below opcache.enable shows 'On'. I verified the proper php.ini is being used (/etc/php.d/opcache.ini) and it shows that it is loading up above in the list of loaded config files. I tried replacing zend_extension=opcache.so with the full path to the file, but that didn't work either. I even restarted apache after each of the changes.

I feel like I must be missing something simple, but I have no idea what it is.

via Chebli Mohamed