SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '685155b8e68d50ee7175fd4824295961cbddf30b7a4b9f5062ac35ad71a624db' 
  AND token = 'QVOwUuFyl/c7v8+/sGctMFTG9Wulm+YSZKZ2a4gPEBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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