SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0bd9378a813e93810ebfb2d961e21cd8f0d8845bae427af78c7d2e159cb00c6b' 
  AND token = 'M5Wx4WvJSWJ8Uqz6fWaAVZV+pCszaFgLCAvSwQSlA8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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