SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4fb30401a9e7cceb84c1adca5493902247e2887369aa102fb6af572072ec9485' 
  AND token = 'uMxAQtemg5kfCdIKvW8Op3ZBXJ7OZ5zXPZgAV9t8YF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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