SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e72b639d05050c5aa9a2e11ef0d6f794c35e3d40c47d5a8c10578f5b4718ccf' 
  AND token = 'VYUwr+YW8tja8VrnPacMVm/sRAnB0ZnNRv6l/uWFuwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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