SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '85764f70f4fc19ab62b7587977bf555b8450606bc0d28ddf8136e01f07da2444' 
  AND token = '5OrBKJKaQ13KYjBUfgMhpv6ZeGfRU4CIdQ5ZNIAkjqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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