SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd725a273006375bc0c714518fe1801349958fe4415234a7c709988b1ae0048eb' 
  AND token = 'pXGfK8SrEGODojmBJg6sQ1YH6quzfpZvjUmGNRGfTJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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