SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a6af9df7e5835c08ad108096178a86ecd69d392e9ba0723a70bef70a4d153ee' 
  AND token = 'stxxNmJ2KdELigcYhlGw/my4HhHvVcQpCW2EUuNEKg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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