Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a43b8a85429ee3594d221655f3875ff513c584aea1f642d8eeaa960896a6d435' 
  AND token = 'y39N8PNUQx/rQs2iTYNA2HjmrBQCi9seoxGmLiWr8/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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