SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '65d55cf2d7ab48285928ee8f909d7b92ecec1c354f8fe5cf4d360c3af68916b2' 
  AND token = 'INvdcKhD78rjTA0Vv2XsYti7uyL+HbRJGbV2BVeyfhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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