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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9c0d2f99ca1196343171a9b00ed4a12860f92c19a9eef487870558dd8993aa66' 
  AND token = 'nXMMjLyX24Yc+IxW/uq9tRrpi9+L2Kquu0t8YefcIgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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