SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd08eeb54b9dd39dc4058ea4e58e25abcec09004cea254c7434fc7f161931c5c6' 
  AND token = 'TvuqhgUdmyz+m00kZB56e2rMlNGQvVVxL1JLihMGADU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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