SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '638d9acb3385e11101b867c9b548fd4595329f25a05b63e7792cab41beee2604' 
  AND token = 'dBO8LWZbvNL2jH+Woj2nZo/V785XmtVHwJO3BaWrGKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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