SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd6ea500b51431d636be3312e0d42692597f7e3749792199468b78ccff9709f7c' 
  AND token = 'xZJjBQQuB+sYJF2Z3QYJjEU6KWQJq9cN//6/kpETTdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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