SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a41d7f5800db9057915e77bb6fdc0a6f177b21a6c0461b98852e8b2513a8977' 
  AND token = 'pOKkY6dTkhhwM9yGDGGf3RyFZppkWVn8JcemFFU4/5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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