SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ecbd3b59823c84df10f3a7810984f4e8f105698dc8cf5174bd2096c905183534' 
  AND token = '2yhiQWR76IX3L32jFNwby+d31gSmo8HlLBB8TWqOVeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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