SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b01017dce9bc0978b7d748567a9321670daf53b7197835e4e582e16ffbf2fc52' 
  AND token = 'nmT0GbfhGwjhnAi1ErfWJYp0VIHKcNK/BDphVKVjPtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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