SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f53d93d56f7f63f95c8b7e3fd3db8115a2c5d1a2c4d0e537a424f45b85b3baf2' 
  AND token = 'g4CJMqlU0qaMoJMcurhOMrC3jDL/HUwIG8T7ATVh53A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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