SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3a352b5a72ee8f838054fc19e15ed8c78774133e89c10df376877661c3cbb7aa' 
  AND token = 'sTBvVTF5zRqj9jwUnHBXd2vhHoUZON1tT8i8grDV2HE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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