SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc07b88ebb5ed728badbd4ba585bd2b35390873c312d936373b325ef3db96cf9' 
  AND token = 'rZ+xCeUY0zTSeQhUajjtO0NnvvpU/JwLeBm41NeBBwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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