SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '59f4b7911285e1ae9229c450b98432ef729bb2c94c75206a18641946e7f139d7' 
  AND token = '6MyYt7gz2ZPdFLGhtuEd9QuBqFTK1ScgY7pIPlAPWCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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