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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '73bdfb80c90bbd8efd8a66dc0f729f33beb4d5ea987852277edbe87aca02243a' 
  AND token = '4SJDdcJ3y1ACjsnhuOz2CIzNz5M2tWF+epOH8WMeoFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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