SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '620489a4db61f9b041d6d901f3c3851bd3b4fb521ca0613a592a5bb39125fa39' 
  AND token = 'hxUwJIfuZEETJcm6W0jxVBMmZTQozPCUGRQoJF+nPuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}