Transformando código em CRUD

public function userToken($token) {

        $token = md5(time().rand(0,9999).time().rand(0,9999)); 
        
        $sql = "UPDATE usuarios SET user_token = :token WHERE email = :email";

        $sql = $this->db->prepare($sql);

        $sql->bindValue(":email", $email);
        $sql->bindValue(":token", $token);
        $sql->execute();

        return $token;
    }