SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d47b4a08f486da45ce61dd82d1e110f2084124f762944a4e3ee788148bff70d' 
  AND token = 'cjibGxq5jjYiH627OQqhVMKSDWraj+qXMd+WPg1ZtvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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