SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3dc60ea5fabd1c8666200f951329874b2c6c83bd4afdf49acf361c73fa8a6025' 
  AND token = 'KZeW//4SFfv3OUWRajkpz2q5Cd/nBdCeLh5EaxZK5Is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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