Hi Rus
You don't need both ports connecting to bring the AP up, 1 802.1at port is fine (af power works but only with the radio at 2x2)
If you use both links, you need to do LACP lag with the switch, traffic is distributed across the lag as defined here: https://gtacknowledge.extremenetworks.com/articles/Q_A/What-is-the-hashing-algorithm-used-to-distribute-load-across-links-on-access-points-with-dual-Ethernet-ports-running-LACP/
-Gareth