How to restore a database with innodb tables from files?
With innodb files you need to restore the entire database server to a new instance.Use mysqldump oc_activity_mq to extract a SQL version of the table out of that backup. And then import this into your active instance.

This assumes you've made consistent backup. If mysql was running and being updated at the same time it was copied it might have some form of corruption.

Revist your backup strategy using innodbbackup, lvm, and/or mysqldump/pump.