SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff60b4906c53fddd66a8fa2bda16e9304fdf7c86196fd4e72e7a410e8c404f46' 
  AND token = '7CucvXWZjuyMqo6gZDX0U2woLBevNjEmRGpZjFsxZ8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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