SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c017df7d3046f07b12248eafd0c37b6e7c186d5394c78d786f19d687d8b0c7f' 
  AND token = 'maptnvvx3XujtKcwLAXvI0M6eSbAt/X5FWZGBV/CvOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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