what is the key value for built-in variable: ActualDateAndTime, CurrentTime, ActualTime?

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You seem to be confusing built-in variables with internal variables.

Internal variables are specific to an EnergyPlus object and therefore require a variable_type and a variable_key using self.api.exchange.get_internal_variable_handle(state, variable_type, variable_key).

Built-in variables like ActualDateAndTime are unrelated to EnergyPlus objects. The Data Transfer API provides specific methods for each. For example, you'd use self.api.exchange.actual_date_time(state) to get ActualDateAndTime.

You can read more about built-in variables and internal variables in the EMS Application Guide.