SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '92c79a23c4c56e0be63525a878ae2ea1ae466f152316dbb73da7279712721f24' 
  AND token = 'YZ//+soKI7QVapUP5fKQNVv9suuPu+Hkmy5DwScHu9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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