SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e82a9a54b79ec4313f9b4bb2d53adf4b5154125cb228ad2f06a6753d69933a7c' 
  AND token = '65uVWBSlAiqnOkizwSFevGtxz4gM2GGGNUqJVdeYRGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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