SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4db0dac0b6918e7c9129da423373d169230a1f7ce2e66738a79ebde9eb884226' 
  AND token = 'EC/5cVBuTFGw2TvcjQ2EPOV5b6RvT+mW3jr3BuJsGTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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