Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7606534dc76cae63c688f44d65e1dc4c510ee4a59cdcfcfe1c0dfe0df9702b09' 
  AND token = 'eUzI/yE6cWf8kp1UXGzeQBNwM7wHhQfFu6qWJhAB410=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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