SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf17014264681d555b77ca9d8ff6a3dd03a6b1e2e6b816bf43ee8740932fcd5f' 
  AND token = 'yzZLfGzh3U0gdZk4/UI1HwjwXGcDY9UbhSREEgIgVWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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