Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '31d91a2a8adb8c6a0f6c6bdd1a0bb98eb5845d77847ce34892bbba4fd8e6958a' 
  AND token = 'pYNdb8kqWr//lZRHGXlsl7mLFCNYSsooEIFI01IR8zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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