SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd0df995054602f0d2c85cb1b2d84bd85c6fa37c26d4a6213d53398475f70454c' 
  AND token = 'Y9XZNwQ12fZoX6BFcGwnmRuTK2RmYmAXUGtmMBwSZBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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