SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8824a6483feab869a37e5d1f0f17873acae5fd765e8f6f6a70f406409073cbb3' 
  AND token = 'ORrO/gKip6ln9Mk/zQGoqlyXvmu9fQrm79OxV+VcO6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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