SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a104221e8bc4f906a7f1d7256a47b8088b5930733ca766f6fef34d8c267aa0b2' 
  AND token = '+SJuhD1725KAb3jH7ReD9v9qvZmX2QWUKm9TxisXSrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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