SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '79b761a84811754633d8467be1a29212d3e9b0f7321b9e8ae2b062c2fed93ea2' 
  AND token = 'qWvQNUxGY+1VibzqNQ4gDj0AAIw9G6tJK+hUfC/ZL+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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