SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '693e44db0fbd84059ac8cd6325a515253443d91ccea9d1b89610de511e72161c' 
  AND token = 'KuNjS97BIKXKWPnCB/aWbC6N8TZ9VWgy2fJiLY1IwPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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