SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f331104f21e23db1b839dd4759f13b212bf77a9a06747b5b499c2f9435bbee5f' 
  AND token = 'A2UPtCzKwXP72MQ7YweBIZZXEXe9LRjtjKmkuICsph8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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