SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee3b371de4a4f9fb4c236812144c35ef2adac47538919783d796379744985452' 
  AND token = 'zCRwn3ROqKRgg8GK+vkqD7YZdD5u9vEotiD/zEO2I8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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