SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '887732c123e0d39bd6f243aef990841300a8d9b0b8a4012700d5257fc0ded779' 
  AND token = '4CNG6d5/fOUVh/jYa8IQAHgB5Xnjr4kL71US7qVndiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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