SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '043f213ceb3784275c5e704fa0abb66f72a90172e6bcd3840af7e4e9b80f35fd' 
  AND token = 'WjL/qi/2m+9Yvq8/NLyuri/x9vtOFwtF9gWyZEUQWWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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