SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd84a276207e0040ae29549e4ad99d67f6181c6711cd3d9615f5ba97456bb57a7' 
  AND token = 'Z++Yepa6xCGQFKfllLLTzS+eZrL6GDwtYoVqljnUE4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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