SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '727359ce36c6047eb75d3b1a344edd74b63a708b3b2d262ba9690153e52d7c1a' 
  AND token = 'vzphw4/BgB3BKAcg1OF5tHBeqdgWquKfQrI3fbxJLSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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