SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8889abcd6f92e491c64b418ca06cb40f76e89eaa69360d0273418966564f5ef4' 
  AND token = 'S6ejzXh7RotWNvM/+U+9wQrU4stl+0Rz1BMiJfVmY3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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