SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1954f24a1fb6d1f8c18d9dd48cf7e35373c67398cb35e5de6b7b8219c5f9b0f2' 
  AND token = 'xWXGVAovNjXL93BpaivaxJyilxgVdIYX+HwVPay7KvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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