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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '29762198801adfef2350da8be77ac385d14db8f380d86b191d41fc8dafe74e28' 
  AND token = 'LEkLF526B11p6XV/9oLAHKJFPk55Rbf/7ZJIbN6Wg64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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