SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6eb155fd902a4e4870642c03682d42597911e706c40442bec5d3a2ec62c8413c' 
  AND token = '0tjbDKSE8VZdJlyGwq0qmxlOj6NMO0EoAQ+fFnlZxhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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