SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '071d6d741fe27db9e8560a247c84f16dfded08b884389f226cd01fcd86c8e176' 
  AND token = 'BmlgRznqiX/F6XGfyp+aweltU86OZr4gw9nx9DKJufA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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