SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ba70e592036a1883a396d3d9d6920782fdb6e7d68822797175dbdfb9bf564db' 
  AND token = 'Pq1ppTPz1vWu3l8s6qKTzjzmOaA8QjfD61TYnD+mThY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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