SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3137d039503c0ce895558e698a17f1ab407222f2438fba9138598f5d9dbf4958' 
  AND token = 'Nw/vjX05CTwuddFBuGZ9SfIhEGMHcIiNB8DOmRTWLEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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