SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '498c5f60f34d1d893f4fbce55562fef62e0e407f8f3391c94b019c4fc865f619' 
  AND token = 'BY1zHFDucKKZH73ZWURvtgmauLWObnD/M3TJsZKBf/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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