SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b38cbf750f68203a466b79e2903cf8bbac91311902fb354537d9a24bec43ecc' 
  AND token = 'n1nusRIyf5IMmHqj59lWZ2wSqhFGVhfLRipTEPGeaXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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