SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a636ee7f105ae8590fdb498a8cd5c4236ced33263b6d64cf454cb02cb7d39854' 
  AND token = '+0CRIRH0GQM5xq5YhBMZiUBGyhmbIH4oAwOjX0kEStc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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