Our church, Emmanuel United Methodist Church in North Laurel, has a preschool for ages 2-5. The web-site says they have openings for 2020-2021 school year in the 3 and 4 year old classes. They do have before and after care and half-day, extended-day and before/after care are all available.
I have to admit that I don't know much about the program, but the web-site says that they are MSDE (MD State Dept of Education) certified at a level 5 rating. The rooms are well organized. My children attend Sunday school in two of the preschool rooms on Sundays, so we've seen the rooms. And from the displays on the walls, they do teach the basics. Plus the playground is nice (my kids have played there).
EUMC is located just off MD-216 between MD-29 and I-95, so it is convenient for you in Burtonsville. You can find more on their web-site at:
http://www.emmanuelpreschool.com/