SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3dcb75063c9f4302811d925b71ce780a2b48e65027e3f47e22b66def010d2667' 
  AND token = 'vS/79UPPrPmPZ9MrRIKZ/4S5RwvCK8wVhOxiTItjgFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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