SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd2d27ddf639415a9a6866e177050bf34ec441f8004933c9e4d90c3821a03fb24' 
  AND token = 'kTSJK8dO+bg1CbSY2tbg6n6w7Xwh2X0zKANAFvGzpic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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