SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '46b21d5a49383e6052b25b6ad28d170bc5877a98a1fd7626b175607992aed029' 
  AND token = 'CvlXwwjTBYF/Ix9hObMFWBQ/2SdonsbpqbveaHN9QBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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