SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9aca6ad74c543f7673851be881670909614c688ac8c269c16b55552f39d272fc' 
  AND token = 'hw6yzAiGof0oHlhNJYqgiLCQ3/pw7+2ZlICO9RmF1aI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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