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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f622cd10828288d131352dbed289b632c20cfc235e5be3986f3b9b60ab28b206' 
  AND token = 'waN6IRHQyLGn4MvZVvDf/oa1j9SCVnZy2yLXzi4Dx28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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