SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '551f7b6931fe666aaf7c2afca8fad6718d8f1422b8fbaa21dc5076214464992b' 
  AND token = 'kYoHP2IZuqhZIItGnoBhN9TuCFVT8N/RB9XzltQUg7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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