Amazon State Language (ASL) for created a state machine to schedule a one-time invocation of a Lambda function.

schedule-lambda-asl.json

{
  "Comment": "Invoking Lambda at arbitrary time.",
  "StartAt": "CountDownTimer",
  "States": {
    "CountDownTimer": {
      "Type": "Wait",
      "TimestampPath": "$.invocationTime",
      "Next": "InvokeLambda"
    },
    "InvokeLambda": {
      "Type": "Task",
      "Resource": "arn:aws:lambda:REGION:ACCOUNT_ID:function:FUNCTION_NAME",
      "End": true
    }
  }
}

schedule-lambda-input.json

{
  "invocationTime": "2018-02-25T10:52:00Z"
}