SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e05b9cc66fc1b3cb7ee3733e004bddb6921d59834a9a55bf61ffd1785da32de4' 
  AND token = 'rq+LiWht0PWtLF8o8IwzbmGLZY1l5l+PwKkS25fwEMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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