SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e58a745909c3d58b7040ea5c6c487a761ffc179bd0b8fbe9c1786bdc8cfff2a' 
  AND token = 'mmZ4LYPa+HNg1haxK6lkyJsRdnb4UgpSQ2dYGFFAK1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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