Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e9c7673048365dd6f5693d7f010b745abc666efc52b927ccc697de8dfd1592a8' 
  AND token = '++vEF37o/i0xIxg89moQxdGE9ChkPdpqTH/cQtisslg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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