SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9615f440a02b39f5f27ca8ef62318742ca5a86222fc6cf3e3ba4bc3d283ce69d' 
  AND token = '0wa+ViAZN78peBOCHwLbKHG9+R/9+3sQdFsJYeUHSdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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