SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd30aa3014ce07dc6f2bf9472a2fcc4858658b8cd9d43d6bd1a86c4391a4f00e3' 
  AND token = 'ymwwKzWnBVP/Ahx9OujhoKaH/D7TgGugBVtmkSVC5Ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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