SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '133589ec9b1e0bb034d83cafb648b3fc21441cf6f65651dc78dc870004be828f' 
  AND token = 'poQoMJsEX/b6X6XJzBe51LKVqLy2huwDL+Wq+cIYv/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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