SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2feb9fb975b71f4a1387254fd06cd4008fd6d4f9cb33d0a74e37771df65bded3' 
  AND token = 'NnjCZtoZWhWBDhiEke6pXdHKn/BBI6CJ4cwOMVh9+KM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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